#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
-#include <linux/slab.h>
#include <linux/kernel.h>
+#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include "scsi_priv.h"
#include "scsi_logging.h"
+#include "scsi_transport_api.h"
#define SENSE_TIMEOUT (10*HZ)
-#define START_UNIT_TIMEOUT (30*HZ)
/*
* These should *probably* be handled by the host itself.
}
/**
+ * scsi_schedule_eh - schedule EH for SCSI host
+ * @shost: SCSI host to invoke error handling on.
+ *
+ * Schedule SCSI EH without scmd.
+ */
+void scsi_schedule_eh(struct Scsi_Host *shost)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+
+ if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 ||
+ scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) {
+ shost->host_eh_scheduled++;
+ scsi_eh_wakeup(shost);
+ }
+
+ spin_unlock_irqrestore(shost->host_lock, flags);
+}
+EXPORT_SYMBOL_GPL(scsi_schedule_eh);
+
+/**
* scsi_eh_scmd_add - add scsi cmd to error handling.
* @scmd: scmd to run eh on.
* @eh_flag: optional SCSI_EH flag.
*
* Return value:
* 0 on failure.
- **/
+ */
int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
{
struct Scsi_Host *shost = scmd->device->host;
* This should be turned into an inline function. Each scsi command
* has its own timer, and as it is added to the queue, we set up the
* timer. When the command completes, we cancel the timer.
- **/
+ */
void scsi_add_timer(struct scsi_cmnd *scmd, int timeout,
void (*complete)(struct scsi_cmnd *))
{
* Return value:
* 1 if we were able to detach the timer. 0 if we blew it, and the
* timer function has already started to run.
- **/
+ */
int scsi_delete_timer(struct scsi_cmnd *scmd)
{
int rtn;
* only in that the normal completion handling might run, but if the
* normal completion function determines that the timer has already
* fired, then it mustn't do anything.
- **/
+ */
void scsi_times_out(struct scsi_cmnd *scmd)
{
+ enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+
scsi_log_completion(scmd, TIMEOUT_ERROR);
if (scmd->device->host->transportt->eh_timed_out)
- switch (scmd->device->host->transportt->eh_timed_out(scmd)) {
+ eh_timed_out = scmd->device->host->transportt->eh_timed_out;
+ else if (scmd->device->host->hostt->eh_timed_out)
+ eh_timed_out = scmd->device->host->hostt->eh_timed_out;
+ else
+ eh_timed_out = NULL;
+
+ if (eh_timed_out)
+ switch (eh_timed_out(scmd)) {
case EH_HANDLED:
__scsi_done(scmd);
return;
*
* Return value:
* 0 when dev was taken offline by error recovery. 1 OK to proceed.
- **/
+ */
int scsi_block_when_processing_errors(struct scsi_device *sdev)
{
int online;
* scsi_eh_prt_fail_stats - Log info on failures.
* @shost: scsi host being recovered.
* @work_q: Queue of scsi cmds to process.
- **/
+ */
static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost,
struct list_head *work_q)
{
* Notes:
* When a deferred error is detected the current command has
* not been executed and needs retrying.
- **/
+ */
static int scsi_check_sense(struct scsi_cmnd *scmd)
{
struct scsi_sense_hdr sshdr;
return SUCCESS;
case MEDIUM_ERROR:
+ if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */
+ sshdr.asc == 0x13 || /* AMNF DATA FIELD */
+ sshdr.asc == 0x14) { /* RECORD NOT FOUND */
+ return SUCCESS;
+ }
return NEEDS_RETRY;
case HARDWARE_ERROR:
* queued during error recovery. the main difference here is that we
* don't allow for the possibility of retries here, and we are a lot
* more restrictive about what we consider acceptable.
- **/
+ */
static int scsi_eh_completed_normally(struct scsi_cmnd *scmd)
{
/*
/**
* scsi_eh_done - Completion function for error handling.
* @scmd: Cmd that is done.
- **/
+ */
static void scsi_eh_done(struct scsi_cmnd *scmd)
{
struct completion *eh_action;
}
/**
- * scsi_send_eh_cmnd - send a cmd to a device as part of error recovery.
- * @scmd: SCSI Cmd to send.
- * @timeout: Timeout for cmd.
+ * scsi_try_host_reset - ask host adapter to reset itself
+ * @scmd: SCSI cmd to send hsot reset.
+ */
+static int scsi_try_host_reset(struct scsi_cmnd *scmd)
+{
+ unsigned long flags;
+ int rtn;
+
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
+ __FUNCTION__));
+
+ if (!scmd->device->host->hostt->eh_host_reset_handler)
+ return FAILED;
+
+ rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
+
+ if (rtn == SUCCESS) {
+ if (!scmd->device->host->hostt->skip_settle_delay)
+ ssleep(HOST_RESET_SETTLE_TIME);
+ spin_lock_irqsave(scmd->device->host->host_lock, flags);
+ scsi_report_bus_reset(scmd->device->host,
+ scmd_channel(scmd));
+ spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ }
+
+ return rtn;
+}
+
+/**
+ * scsi_try_bus_reset - ask host to perform a bus reset
+ * @scmd: SCSI cmd to send bus reset.
+ */
+static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
+{
+ unsigned long flags;
+ int rtn;
+
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
+ __FUNCTION__));
+
+ if (!scmd->device->host->hostt->eh_bus_reset_handler)
+ return FAILED;
+
+ rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd);
+
+ if (rtn == SUCCESS) {
+ if (!scmd->device->host->hostt->skip_settle_delay)
+ ssleep(BUS_RESET_SETTLE_TIME);
+ spin_lock_irqsave(scmd->device->host->host_lock, flags);
+ scsi_report_bus_reset(scmd->device->host,
+ scmd_channel(scmd));
+ spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ }
+
+ return rtn;
+}
+
+static void __scsi_report_device_reset(struct scsi_device *sdev, void *data)
+{
+ sdev->was_reset = 1;
+ sdev->expecting_cc_ua = 1;
+}
+
+/**
+ * scsi_try_target_reset - Ask host to perform a target reset
+ * @scmd: SCSI cmd used to send a target reset
+ *
+ * Notes:
+ * There is no timeout for this operation. if this operation is
+ * unreliable for a given host, then the host itself needs to put a
+ * timer on it, and set the host back to a consistent state prior to
+ * returning.
+ */
+static int scsi_try_target_reset(struct scsi_cmnd *scmd)
+{
+ unsigned long flags;
+ int rtn;
+
+ if (!scmd->device->host->hostt->eh_target_reset_handler)
+ return FAILED;
+
+ rtn = scmd->device->host->hostt->eh_target_reset_handler(scmd);
+ if (rtn == SUCCESS) {
+ spin_lock_irqsave(scmd->device->host->host_lock, flags);
+ __starget_for_each_device(scsi_target(scmd->device), NULL,
+ __scsi_report_device_reset);
+ spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ }
+
+ return rtn;
+}
+
+/**
+ * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
+ * @scmd: SCSI cmd used to send BDR
+ *
+ * Notes:
+ * There is no timeout for this operation. if this operation is
+ * unreliable for a given host, then the host itself needs to put a
+ * timer on it, and set the host back to a consistent state prior to
+ * returning.
+ */
+static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
+{
+ int rtn;
+
+ if (!scmd->device->host->hostt->eh_device_reset_handler)
+ return FAILED;
+
+ rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
+ if (rtn == SUCCESS)
+ __scsi_report_device_reset(scmd->device, NULL);
+ return rtn;
+}
+
+static int __scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
+{
+ if (!scmd->device->host->hostt->eh_abort_handler)
+ return FAILED;
+
+ return scmd->device->host->hostt->eh_abort_handler(scmd);
+}
+
+/**
+ * scsi_try_to_abort_cmd - Ask host to abort a running command.
+ * @scmd: SCSI cmd to abort from Lower Level.
+ *
+ * Notes:
+ * This function will not return until the user's completion function
+ * has been called. there is no timeout on this operation. if the
+ * author of the low-level driver wishes this operation to be timed,
+ * they can provide this facility themselves. helper functions in
+ * scsi_error.c can be supplied to make this easier to do.
+ */
+static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
+{
+ /*
+ * scsi_done was called just after the command timed out and before
+ * we had a chance to process it. (db)
+ */
+ if (scmd->serial_number == 0)
+ return SUCCESS;
+ return __scsi_try_to_abort_cmd(scmd);
+}
+
+static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd)
+{
+ if (__scsi_try_to_abort_cmd(scmd) != SUCCESS)
+ if (scsi_try_bus_device_reset(scmd) != SUCCESS)
+ if (scsi_try_target_reset(scmd) != SUCCESS)
+ if (scsi_try_bus_reset(scmd) != SUCCESS)
+ scsi_try_host_reset(scmd);
+}
+
+/**
+ * scsi_eh_prep_cmnd - Save a scsi command info as part of error recory
+ * @scmd: SCSI command structure to hijack
+ * @ses: structure to save restore information
+ * @cmnd: CDB to send. Can be NULL if no new cmnd is needed
+ * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB)
+ * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
+ *
+ * This function is used to save a scsi command information before re-execution
+ * as part of the error recovery process. If @sense_bytes is 0 the command
+ * sent must be one that does not transfer any data. If @sense_bytes != 0
+ * @cmnd is ignored and this functions sets up a REQUEST_SENSE command
+ * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer.
+ */
+void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
+ unsigned char *cmnd, int cmnd_size, unsigned sense_bytes)
+{
+ struct scsi_device *sdev = scmd->device;
+
+ /*
+ * We need saved copies of a number of fields - this is because
+ * error handling may need to overwrite these with different values
+ * to run different commands, and once error handling is complete,
+ * we will need to restore these values prior to running the actual
+ * command.
+ */
+ ses->cmd_len = scmd->cmd_len;
+ ses->cmnd = scmd->cmnd;
+ ses->data_direction = scmd->sc_data_direction;
+ ses->sdb = scmd->sdb;
+ ses->next_rq = scmd->request->next_rq;
+ ses->result = scmd->result;
+
+ scmd->cmnd = ses->eh_cmnd;
+ memset(scmd->cmnd, 0, BLK_MAX_CDB);
+ memset(&scmd->sdb, 0, sizeof(scmd->sdb));
+ scmd->request->next_rq = NULL;
+
+ if (sense_bytes) {
+ scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE,
+ sense_bytes);
+ sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
+ scmd->sdb.length);
+ scmd->sdb.table.sgl = &ses->sense_sgl;
+ scmd->sc_data_direction = DMA_FROM_DEVICE;
+ scmd->sdb.table.nents = 1;
+ scmd->cmnd[0] = REQUEST_SENSE;
+ scmd->cmnd[4] = scmd->sdb.length;
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+ } else {
+ scmd->sc_data_direction = DMA_NONE;
+ if (cmnd) {
+ BUG_ON(cmnd_size > BLK_MAX_CDB);
+ memcpy(scmd->cmnd, cmnd, cmnd_size);
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+ }
+ }
+
+ scmd->underflow = 0;
+
+ if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN)
+ scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
+ (sdev->lun << 5 & 0xe0);
+
+ /*
+ * Zero the sense buffer. The scsi spec mandates that any
+ * untransferred sense data should be interpreted as being zero.
+ */
+ memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+}
+EXPORT_SYMBOL(scsi_eh_prep_cmnd);
+
+/**
+ * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory
+ * @scmd: SCSI command structure to restore
+ * @ses: saved information from a coresponding call to scsi_prep_eh_cmnd
+ *
+ * Undo any damage done by above scsi_prep_eh_cmnd().
+ */
+void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
+{
+ /*
+ * Restore original data
+ */
+ scmd->cmd_len = ses->cmd_len;
+ scmd->cmnd = ses->cmnd;
+ scmd->sc_data_direction = ses->data_direction;
+ scmd->sdb = ses->sdb;
+ scmd->request->next_rq = ses->next_rq;
+ scmd->result = ses->result;
+}
+EXPORT_SYMBOL(scsi_eh_restore_cmnd);
+
+/**
+ * scsi_send_eh_cmnd - submit a scsi command as part of error recory
+ * @scmd: SCSI command structure to hijack
+ * @cmnd: CDB to send
+ * @cmnd_size: size in bytes of @cmnd
+ * @timeout: timeout for this request
+ * @sense_bytes: size of sense data to copy or 0
+ *
+ * This function is used to send a scsi command down to a target device
+ * as part of the error recovery process. See also scsi_eh_prep_cmnd() above.
*
* Return value:
* SUCCESS or FAILED or NEEDS_RETRY
- **/
-static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout)
+ */
+static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
+ int cmnd_size, int timeout, unsigned sense_bytes)
{
struct scsi_device *sdev = scmd->device;
struct Scsi_Host *shost = sdev->host;
- DECLARE_COMPLETION(done);
+ DECLARE_COMPLETION_ONSTACK(done);
unsigned long timeleft;
unsigned long flags;
+ struct scsi_eh_save ses;
int rtn;
- if (sdev->scsi_level <= SCSI_2)
- scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
- (sdev->lun << 5 & 0xe0);
-
+ scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes);
shost->eh_action = &done;
spin_lock_irqsave(shost->host_lock, flags);
break;
}
} else {
- /*
- * FIXME(eric) - we are not tracking whether we could
- * abort a timed out command or not. not sure how
- * we should treat them differently anyways.
- */
- if (shost->hostt->eh_abort_handler)
- shost->hostt->eh_abort_handler(scmd);
+ scsi_abort_eh_cmnd(scmd);
rtn = FAILED;
}
+ scsi_eh_restore_cmnd(scmd, &ses);
return rtn;
}
* Some hosts automatically obtain this information, others require
* that we obtain it on our own. This function will *not* return until
* the command either times out, or it completes.
- **/
+ */
static int scsi_request_sense(struct scsi_cmnd *scmd)
{
- static unsigned char generic_sense[6] =
- {REQUEST_SENSE, 0, 0, 0, 252, 0};
- unsigned char *scsi_result;
- int saved_result;
- int rtn;
-
- memcpy(scmd->cmnd, generic_sense, sizeof(generic_sense));
-
- scsi_result = kmalloc(252, GFP_ATOMIC | ((scmd->device->host->hostt->unchecked_isa_dma) ? __GFP_DMA : 0));
-
-
- if (unlikely(!scsi_result)) {
- printk(KERN_ERR "%s: cannot allocate scsi_result.\n",
- __FUNCTION__);
- return FAILED;
- }
-
- /*
- * zero the sense buffer. some host adapters automatically always
- * request sense, so it is not a good idea that
- * scmd->request_buffer and scmd->sense_buffer point to the same
- * address (db). 0 is not a valid sense code.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
- memset(scsi_result, 0, 252);
-
- saved_result = scmd->result;
- scmd->request_buffer = scsi_result;
- scmd->request_bufflen = 252;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->sc_data_direction = DMA_FROM_DEVICE;
- scmd->underflow = 0;
-
- rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT);
-
- /* last chance to have valid sense data */
- if(!SCSI_SENSE_VALID(scmd)) {
- memcpy(scmd->sense_buffer, scmd->request_buffer,
- sizeof(scmd->sense_buffer));
- }
-
- kfree(scsi_result);
-
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
- return rtn;
+ return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0);
}
/**
* Notes:
* We don't want to use the normal command completion while we are are
* still handling errors - it may cause other commands to be queued,
- * and that would disturb what we are doing. thus we really want to
+ * and that would disturb what we are doing. Thus we really want to
* keep a list of pending commands for final completion, and once we
* are ready to leave error handling we handle completion for real.
- **/
+ */
void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
{
scmd->device->host->host_failed--;
scmd->eh_eflags = 0;
-
- /*
- * set this back so that the upper level can correctly free up
- * things.
- */
- scsi_setup_cmd_retry(scmd);
list_move_tail(&scmd->eh_entry, done_q);
}
EXPORT_SYMBOL(scsi_eh_finish_cmd);
/**
* scsi_eh_get_sense - Get device sense data.
* @work_q: Queue of commands to process.
- * @done_q: Queue of proccessed commands..
+ * @done_q: Queue of processed commands.
*
* Description:
* See if we need to request sense information. if so, then get it
*
* Notes:
* This has the unfortunate side effect that if a shost adapter does
- * not automatically request sense information, that we end up shutting
+ * not automatically request sense information, we end up shutting
* it down before we request it.
*
* All drivers should request sense information internally these days,
*
* XXX: Long term this code should go away, but that needs an audit of
* all LLDDs first.
- **/
-static int scsi_eh_get_sense(struct list_head *work_q,
- struct list_head *done_q)
+ */
+int scsi_eh_get_sense(struct list_head *work_q,
+ struct list_head *done_q)
{
struct scsi_cmnd *scmd, *next;
int rtn;
return list_empty(work_q);
}
-
-/**
- * scsi_try_to_abort_cmd - Ask host to abort a running command.
- * @scmd: SCSI cmd to abort from Lower Level.
- *
- * Notes:
- * This function will not return until the user's completion function
- * has been called. there is no timeout on this operation. if the
- * author of the low-level driver wishes this operation to be timed,
- * they can provide this facility themselves. helper functions in
- * scsi_error.c can be supplied to make this easier to do.
- **/
-static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
-{
- if (!scmd->device->host->hostt->eh_abort_handler)
- return FAILED;
-
- /*
- * scsi_done was called just after the command timed out and before
- * we had a chance to process it. (db)
- */
- if (scmd->serial_number == 0)
- return SUCCESS;
- return scmd->device->host->hostt->eh_abort_handler(scmd);
-}
+EXPORT_SYMBOL_GPL(scsi_eh_get_sense);
/**
* scsi_eh_tur - Send TUR to device.
- * @scmd: Scsi cmd to send TUR
+ * @scmd: &scsi_cmnd to send TUR
*
* Return value:
* 0 - Device is ready. 1 - Device NOT ready.
- **/
+ */
static int scsi_eh_tur(struct scsi_cmnd *scmd)
{
static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0};
int retry_cnt = 1, rtn;
- int saved_result;
retry_tur:
- memcpy(scmd->cmnd, tur_command, sizeof(tur_command));
-
- /*
- * zero the sense buffer. the scsi spec mandates that any
- * untransferred sense data should be interpreted as being zero.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
-
- saved_result = scmd->result;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->underflow = 0;
- scmd->sc_data_direction = DMA_NONE;
-
- rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT);
+ rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0);
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
-
- /*
- * hey, we are done. let's look to see what happened.
- */
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
__FUNCTION__, scmd, rtn));
- if (rtn == SUCCESS)
- return 0;
- else if (rtn == NEEDS_RETRY) {
+
+ switch (rtn) {
+ case NEEDS_RETRY:
if (retry_cnt--)
goto retry_tur;
+ /*FALLTHRU*/
+ case SUCCESS:
return 0;
+ default:
+ return 1;
}
- return 1;
}
/**
- * scsi_eh_abort_cmds - abort canceled commands.
- * @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
+ * scsi_eh_abort_cmds - abort pending commands.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
*
* Decription:
* Try and see whether or not it makes sense to try and abort the
- * running command. this only works out to be the case if we have one
- * command that has timed out. if the command simply failed, it makes
+ * running command. This only works out to be the case if we have one
+ * command that has timed out. If the command simply failed, it makes
* no sense to try and abort the command, since as far as the shost
* adapter is concerned, it isn't running.
- **/
+ */
static int scsi_eh_abort_cmds(struct list_head *work_q,
struct list_head *done_q)
{
}
/**
- * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
- * @scmd: SCSI cmd used to send BDR
- *
- * Notes:
- * There is no timeout for this operation. if this operation is
- * unreliable for a given host, then the host itself needs to put a
- * timer on it, and set the host back to a consistent state prior to
- * returning.
- **/
-static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
-{
- int rtn;
-
- if (!scmd->device->host->hostt->eh_device_reset_handler)
- return FAILED;
-
- rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
- if (rtn == SUCCESS) {
- scmd->device->was_reset = 1;
- scmd->device->expecting_cc_ua = 1;
- }
-
- return rtn;
-}
-
-/**
* scsi_eh_try_stu - Send START_UNIT to device.
- * @scmd: Scsi cmd to send START_UNIT
+ * @scmd: &scsi_cmnd to send START_UNIT
*
* Return value:
* 0 - Device is ready. 1 - Device NOT ready.
- **/
+ */
static int scsi_eh_try_stu(struct scsi_cmnd *scmd)
{
static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0};
- int rtn;
- int saved_result;
-
- if (!scmd->device->allow_restart)
- return 1;
-
- memcpy(scmd->cmnd, stu_command, sizeof(stu_command));
- /*
- * zero the sense buffer. the scsi spec mandates that any
- * untransferred sense data should be interpreted as being zero.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
+ if (scmd->device->allow_restart) {
+ int i, rtn = NEEDS_RETRY;
- saved_result = scmd->result;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->underflow = 0;
- scmd->sc_data_direction = DMA_NONE;
+ for (i = 0; rtn == NEEDS_RETRY && i < 2; i++)
+ rtn = scsi_send_eh_cmnd(scmd, stu_command, 6,
+ scmd->device->timeout, 0);
- rtn = scsi_send_eh_cmnd(scmd, START_UNIT_TIMEOUT);
-
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
+ if (rtn == SUCCESS)
+ return 0;
+ }
- /*
- * hey, we are done. let's look to see what happened.
- */
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
- __FUNCTION__, scmd, rtn));
- if (rtn == SUCCESS)
- return 0;
return 1;
}
/**
* scsi_eh_stu - send START_UNIT if needed
- * @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
+ * @shost: &scsi host being recovered.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
*
* Notes:
* If commands are failing due to not ready, initializing command required,
* try revalidating the device, which will end up sending a start unit.
- **/
+ */
static int scsi_eh_stu(struct Scsi_Host *shost,
struct list_head *work_q,
struct list_head *done_q)
/**
* scsi_eh_bus_device_reset - send bdr if needed
* @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
*
* Notes:
- * Try a bus device reset. still, look to see whether we have multiple
+ * Try a bus device reset. Still, look to see whether we have multiple
* devices that are jammed or not - if we have multiple devices, it
* makes no sense to try bus_device_reset - we really would need to try
* a bus_reset instead.
- **/
+ */
static int scsi_eh_bus_device_reset(struct Scsi_Host *shost,
struct list_head *work_q,
struct list_head *done_q)
}
/**
- * scsi_try_bus_reset - ask host to perform a bus reset
- * @scmd: SCSI cmd to send bus reset.
- **/
-static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
-{
- unsigned long flags;
- int rtn;
-
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
- __FUNCTION__));
-
- if (!scmd->device->host->hostt->eh_bus_reset_handler)
- return FAILED;
-
- rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd);
-
- if (rtn == SUCCESS) {
- if (!scmd->device->host->hostt->skip_settle_delay)
- ssleep(BUS_RESET_SETTLE_TIME);
- spin_lock_irqsave(scmd->device->host->host_lock, flags);
- scsi_report_bus_reset(scmd->device->host,
- scmd_channel(scmd));
- spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
- }
-
- return rtn;
-}
-
-/**
- * scsi_try_host_reset - ask host adapter to reset itself
- * @scmd: SCSI cmd to send hsot reset.
- **/
-static int scsi_try_host_reset(struct scsi_cmnd *scmd)
+ * scsi_eh_target_reset - send target reset if needed
+ * @shost: scsi host being recovered.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
+ *
+ * Notes:
+ * Try a target reset.
+ */
+static int scsi_eh_target_reset(struct Scsi_Host *shost,
+ struct list_head *work_q,
+ struct list_head *done_q)
{
- unsigned long flags;
+ struct scsi_cmnd *scmd, *tgtr_scmd, *next;
+ unsigned int id;
int rtn;
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
- __FUNCTION__));
-
- if (!scmd->device->host->hostt->eh_host_reset_handler)
- return FAILED;
-
- rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
+ for (id = 0; id <= shost->max_id; id++) {
+ tgtr_scmd = NULL;
+ list_for_each_entry(scmd, work_q, eh_entry) {
+ if (id == scmd_id(scmd)) {
+ tgtr_scmd = scmd;
+ break;
+ }
+ }
+ if (!tgtr_scmd)
+ continue;
- if (rtn == SUCCESS) {
- if (!scmd->device->host->hostt->skip_settle_delay)
- ssleep(HOST_RESET_SETTLE_TIME);
- spin_lock_irqsave(scmd->device->host->host_lock, flags);
- scsi_report_bus_reset(scmd->device->host,
- scmd_channel(scmd));
- spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset "
+ "to target %d\n",
+ current->comm, id));
+ rtn = scsi_try_target_reset(tgtr_scmd);
+ if (rtn == SUCCESS) {
+ list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
+ if (id == scmd_id(scmd))
+ if (!scsi_device_online(scmd->device) ||
+ !scsi_eh_tur(tgtr_scmd))
+ scsi_eh_finish_cmd(scmd,
+ done_q);
+ }
+ } else
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset"
+ " failed target: "
+ "%d\n",
+ current->comm, id));
}
- return rtn;
+ return list_empty(work_q);
}
/**
* scsi_eh_bus_reset - send a bus reset
- * @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
- **/
+ * @shost: &scsi host being recovered.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
+ */
static int scsi_eh_bus_reset(struct Scsi_Host *shost,
struct list_head *work_q,
struct list_head *done_q)
* scsi_eh_host_reset - send a host reset
* @work_q: list_head for processed commands.
* @done_q: list_head for processed commands.
- **/
+ */
static int scsi_eh_host_reset(struct list_head *work_q,
struct list_head *done_q)
{
* scsi_eh_offline_sdevs - offline scsi devices that fail to recover
* @work_q: list_head for processed commands.
* @done_q: list_head for processed commands.
- *
- **/
+ */
static void scsi_eh_offline_sdevs(struct list_head *work_q,
struct list_head *done_q)
{
struct scsi_cmnd *scmd, *next;
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
- sdev_printk(KERN_INFO, scmd->device,
- "scsi: Device offlined - not"
- " ready after error recovery\n");
+ sdev_printk(KERN_INFO, scmd->device, "Device offlined - "
+ "not ready after error recovery\n");
scsi_device_set_state(scmd->device, SDEV_OFFLINE);
if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) {
/*
* is woken. In cases where the error code indicates an error that
* doesn't require the error handler read (i.e. we don't need to
* abort/reset), this function should return SUCCESS.
- **/
+ */
int scsi_decide_disposition(struct scsi_cmnd *scmd)
{
int rtn;
*
* If scsi_allocate_request() fails for what ever reason, we
* completely forget to lock the door.
- **/
+ */
static void scsi_eh_lock_door(struct scsi_device *sdev)
{
unsigned char cmnd[MAX_COMMAND_SIZE];
* Notes:
* When we entered the error handler, we blocked all further i/o to
* this device. we need to 'reverse' this process.
- **/
+ */
static void scsi_restart_operations(struct Scsi_Host *shost)
{
struct scsi_device *sdev;
/**
* scsi_eh_ready_devs - check device ready state and recover if not.
* @shost: host to be recovered.
- * @eh_done_q: list_head for processed commands.
- *
- **/
-static void scsi_eh_ready_devs(struct Scsi_Host *shost,
- struct list_head *work_q,
- struct list_head *done_q)
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
+ */
+void scsi_eh_ready_devs(struct Scsi_Host *shost,
+ struct list_head *work_q,
+ struct list_head *done_q)
{
if (!scsi_eh_stu(shost, work_q, done_q))
if (!scsi_eh_bus_device_reset(shost, work_q, done_q))
- if (!scsi_eh_bus_reset(shost, work_q, done_q))
- if (!scsi_eh_host_reset(work_q, done_q))
- scsi_eh_offline_sdevs(work_q, done_q);
+ if (!scsi_eh_target_reset(shost, work_q, done_q))
+ if (!scsi_eh_bus_reset(shost, work_q, done_q))
+ if (!scsi_eh_host_reset(work_q, done_q))
+ scsi_eh_offline_sdevs(work_q,
+ done_q);
}
+EXPORT_SYMBOL_GPL(scsi_eh_ready_devs);
/**
* scsi_eh_flush_done_q - finish processed commands or retry them.
* @done_q: list_head of processed commands.
- *
- **/
+ */
void scsi_eh_flush_done_q(struct list_head *done_q)
{
struct scsi_cmnd *scmd, *next;
* scsi_finish_cmd() called for it. we do all of the retry stuff
* here, so when we restart the host after we return it should have an
* empty queue.
- **/
+ */
static void scsi_unjam_host(struct Scsi_Host *shost)
{
unsigned long flags;
* Notes:
* This is the main error handling loop. This is run as a kernel thread
* for every SCSI host and handles all error handling activity.
- **/
+ */
int scsi_error_handler(void *data)
{
struct Scsi_Host *shost = data;
- current->flags |= PF_NOFREEZE;
-
/*
* We use TASK_INTERRUPTIBLE so that the thread is not
* counted against the load average as a running process.
*/
set_current_state(TASK_INTERRUPTIBLE);
while (!kthread_should_stop()) {
- if (shost->host_failed == 0 ||
+ if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) ||
shost->host_failed != shost->host_busy) {
SCSI_LOG_ERROR_RECOVERY(1,
printk("Error handler scsi_eh_%d sleeping\n",
struct scsi_device *sdev;
__shost_for_each_device(sdev, shost) {
- if (channel == sdev_channel(sdev)) {
- sdev->was_reset = 1;
- sdev->expecting_cc_ua = 1;
- }
+ if (channel == sdev_channel(sdev))
+ __scsi_report_device_reset(sdev, NULL);
}
}
EXPORT_SYMBOL(scsi_report_bus_reset);
__shost_for_each_device(sdev, shost) {
if (channel == sdev_channel(sdev) &&
- target == sdev_id(sdev)) {
- sdev->was_reset = 1;
- sdev->expecting_cc_ua = 1;
- }
+ target == sdev_id(sdev))
+ __scsi_report_device_reset(sdev, NULL);
}
}
EXPORT_SYMBOL(scsi_report_device_reset);
scsi_reset_provider(struct scsi_device *dev, int flag)
{
struct scsi_cmnd *scmd = scsi_get_command(dev, GFP_KERNEL);
+ struct Scsi_Host *shost = dev->host;
struct request req;
+ unsigned long flags;
int rtn;
+ blk_rq_init(NULL, &req);
scmd->request = &req;
memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
- memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
-
+ scmd->cmnd = req.cmd;
+
scmd->scsi_done = scsi_reset_provider_done_command;
- scmd->done = NULL;
- scmd->buffer = NULL;
- scmd->bufflen = 0;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
+ memset(&scmd->sdb, 0, sizeof(scmd->sdb));
scmd->cmd_len = 0;
init_timer(&scmd->eh_timeout);
- /*
- * Sometimes the command can get back into the timer chain,
- * so use the pid as an identifier.
- */
- scmd->pid = 0;
+ spin_lock_irqsave(shost->host_lock, flags);
+ shost->tmf_in_progress = 1;
+ spin_unlock_irqrestore(shost->host_lock, flags);
switch (flag) {
case SCSI_TRY_RESET_DEVICE:
if (rtn == SUCCESS)
break;
/* FALLTHROUGH */
+ case SCSI_TRY_RESET_TARGET:
+ rtn = scsi_try_target_reset(scmd);
+ if (rtn == SUCCESS)
+ break;
+ /* FALLTHROUGH */
case SCSI_TRY_RESET_BUS:
rtn = scsi_try_bus_reset(scmd);
if (rtn == SUCCESS)
rtn = FAILED;
}
+ spin_lock_irqsave(shost->host_lock, flags);
+ shost->tmf_in_progress = 0;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
+ /*
+ * be sure to wake up anyone who was sleeping or had their queue
+ * suspended while we performed the TMF.
+ */
+ SCSI_LOG_ERROR_RECOVERY(3,
+ printk("%s: waking up host to restart after TMF\n",
+ __FUNCTION__));
+
+ wake_up(&shost->host_wait);
+
+ scsi_run_host_queues(shost);
+
scsi_next_command(scmd);
return rtn;
}
*
* Return value:
* 1 if valid sense data information found, else 0;
- **/
+ */
int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
struct scsi_sense_hdr *sshdr)
{
struct scsi_sense_hdr *sshdr)
{
return scsi_normalize_sense(cmd->sense_buffer,
- sizeof(cmd->sense_buffer), sshdr);
+ SCSI_SENSE_BUFFERSIZE, sshdr);
}
EXPORT_SYMBOL(scsi_command_normalize_sense);
/**
- * scsi_sense_desc_find - search for a given descriptor type in
- * descriptor sense data format.
- *
+ * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format.
* @sense_buffer: byte array of descriptor format sense data
* @sb_len: number of valid bytes in sense_buffer
* @desc_type: value of descriptor type to find
*
* Return value:
* pointer to start of (first) descriptor if found else NULL
- **/
+ */
const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
int desc_type)
{
EXPORT_SYMBOL(scsi_sense_desc_find);
/**
- * scsi_get_sense_info_fld - attempts to get information field from
- * sense data (either fixed or descriptor format)
- *
+ * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format)
* @sense_buffer: byte array of sense data
* @sb_len: number of valid bytes in sense_buffer
* @info_out: pointer to 64 integer where 8 or 4 byte information
*
* Return value:
* 1 if information field found, 0 if not found.
- **/
+ */
int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
u64 * info_out)
{
}
}
EXPORT_SYMBOL(scsi_get_sense_info_fld);
+
+/**
+ * scsi_build_sense_buffer - build sense data in a buffer
+ * @desc: Sense format (non zero == descriptor format,
+ * 0 == fixed format)
+ * @buf: Where to build sense data
+ * @key: Sense key
+ * @asc: Additional sense code
+ * @ascq: Additional sense code qualifier
+ *
+ **/
+void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq)
+{
+ if (desc) {
+ buf[0] = 0x72; /* descriptor, current */
+ buf[1] = key;
+ buf[2] = asc;
+ buf[3] = ascq;
+ buf[7] = 0;
+ } else {
+ buf[0] = 0x70; /* fixed, current */
+ buf[2] = key;
+ buf[7] = 0xa;
+ buf[12] = asc;
+ buf[13] = ascq;
+ }
+}
+EXPORT_SYMBOL(scsi_build_sense_buffer);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff